1. Department of Orthopaedics, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan Second Road, Guangzhou, P.R. China
2. Department of Traditional Chinese Medicine, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
3. Department of Neurosurgery, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan Second Road, Guangzhou, P.R. China